A classic in the field of special education, this best-selling book gives readers the most current information on the market today about the many facets of intellectual disabilities from a life-cycle perspective. Featuring a new title change to reflect the field and a newly reorganized Table of Contents, it introduces readers to the litany of concepts related to intellectual disabilities: the basic concepts; biological, psychological, and sociological aspects; the characteristics; programming and issues across the lifespan, and other future issues. The most relevant topics are discussed in fine detail, including the relationship between theory and practice; the terminology used in the field related to the reality of the classroom, the world of work, and the life of the community; a new chapter on professionalism and ethics in special education; integrated information on technology and assistive technology; multiculturalism, diversity, and family values, and the law. Written especially for special educators, this fine volume will engage and benefit other professionals and anyone else interested in working with individuals who have intellectual disabilities.